zoom to user entered coordinates

Forgive me if I've missed this being discussed in the forum already but I searched and didn't find anything that really answered my question.

The question is: How can I take a pair of user entered coordinates (lat/long, easting/northing) from textboxes in the workflow and turn them into a point which I can then pan/zoom the map center to?  Capture Geometry Activity will get input from the map, but I need to let the user enter their own coordinates and zoom to them.

Has anyone done this already that could give me a quick outline of what needs to done (which activities to use)?